
Little snarky there,
Cello Lessons.
The Big Bang Theory Season 5, Episode 12

You mean my CELLO.
The Big Bang Theory Season 1, Episode 5

Are you cool
playing the CELLO?
The Big Bang Theory Season 7, Episode 6

Leonard, you'll play your CELLO.
The Big Bang Theory Season 2, Episode 12

...ever to be stuffed
into his own CELLO case.
The Big Bang Theory Season 4, Episode 18